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Structural studies and magnetic and transport properties of Cr-substituted La0.67Ba0.33Mn1−x Cr x O 3 (0≤ x ≤0.15) perovskites

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Title: Structural studies and magnetic and transport properties of Cr-substituted La0.67Ba0.33Mn1−x Cr x O 3 (0≤ x ≤0.15) perovskites
Authors: Oumezzine, Marwène1,2 marouan.omezzine@etudiant.univ-rennes1.fr, Peña, Octavio2, Kallel, Sami1, Guizouarn, Thierry2, Oumezzine, Mohamed1
Source: Journal of Alloys & Compounds. Aug2012, Vol. 533, p33-40. 8p.
Subjects: Magnetic properties of metals, Transport theory, Chromium compounds, Perovskite, X-ray spectroscopy, Semiconductor doping, Electric conductivity
Abstract: Abstract: We have investigated the structural, magnetic and electrical transport properties of a series of ABO3-type perovskite compounds, La0.67Ba0.33Mn1−x Cr x O 3 (0≤ x ≤0.15), which strongly depend on the doping level x. The slight difference between the ionic radii of Cr3+ and Mn3+ causes no change in the structure when x ≤0.1, remaining rhombohedral (space group R-3C), while for x =0.15 the structure becomes cubic (space group Pm-3m). Energy dispersive X-ray analysis (EDAX) confirms the expected stoichiometry of all samples. Upon Cr doping on the Mn site, the lattice parameters, the unit cell volume and the Bh name="sbnd" />B bond angle are reduced. All samples present a single magnetic transition from ferromagnetic to paramagnetic phase, showing a decrease of the Curie temperature T c and the magnetization M when x increases (x ≤0.15). However, Cr doping makes the saturation magnetization at 5K to decrease, which indicates that the Cr3+ moments tend to be antiparallel to the Mn3+ moments at low temperature. The Cr-doped manganites exhibit a large variation in resistivity values. The increase of Cr doping (x ≤0.15) leads to an increase of the electrical resistivity. Below 10at.% of Cr3+, the electrical resistivity shows a metallic behavior, which is well fitted by the relation ρ = ρ 0 + ρ 2T2 + ρ 4.5T4.5, indicating the importance of the grain/domain boundary, the electron–electron scattering effects and, to a lesser extent, the electron–(magnon, phonon) scattering effects in the mechanism of conduction. On the other hand, the 15at.% of Cr3+ doping makes the material to exhibit a semiconductor behavior, for which the electronic transport can be explained by a variable range hopping (VRH) and small polaron hopping (SPH) models. Results are consistent with a reduction of the number of available hopping sites for the Mn e g (↑) electron due to the substitution of Mn3+ by Cr3+, which suppresses the double exchange (DE) interactions. [Copyright &y& Elsevier]
Copyright of Journal of Alloys & Compounds is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Structural studies and magnetic and transport properties of Cr-substituted La<subscript>0.67</subscript>Ba<subscript>0.33</subscript>Mn<subscript>1−x </subscript>Cr<subscript> x </subscript>O<subscript> 3 </subscript> (0≤ x ≤0.15) perovskites
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  Data: <searchLink fieldCode="AR" term="%22Oumezzine%2C+Marwène%22">Oumezzine, Marwène</searchLink><relatesTo>1,2</relatesTo><i> marouan.omezzine@etudiant.univ-rennes1.fr</i><br /><searchLink fieldCode="AR" term="%22Peña%2C+Octavio%22">Peña, Octavio</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Kallel%2C+Sami%22">Kallel, Sami</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Guizouarn%2C+Thierry%22">Guizouarn, Thierry</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Oumezzine%2C+Mohamed%22">Oumezzine, Mohamed</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Alloys+%26+Compounds%22">Journal of Alloys & Compounds</searchLink>. Aug2012, Vol. 533, p33-40. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Magnetic+properties+of+metals%22">Magnetic properties of metals</searchLink><br /><searchLink fieldCode="DE" term="%22Transport+theory%22">Transport theory</searchLink><br /><searchLink fieldCode="DE" term="%22Chromium+compounds%22">Chromium compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Perovskite%22">Perovskite</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+spectroscopy%22">X-ray spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Semiconductor+doping%22">Semiconductor doping</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+conductivity%22">Electric conductivity</searchLink>
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  Data: Abstract: We have investigated the structural, magnetic and electrical transport properties of a series of ABO3-type perovskite compounds, La0.67Ba0.33Mn1−x Cr x O 3 (0≤ x ≤0.15), which strongly depend on the doping level x. The slight difference between the ionic radii of Cr3+ and Mn3+ causes no change in the structure when x ≤0.1, remaining rhombohedral (space group R-3C), while for x =0.15 the structure becomes cubic (space group Pm-3m). Energy dispersive X-ray analysis (EDAX) confirms the expected stoichiometry of all samples. Upon Cr doping on the Mn site, the lattice parameters, the unit cell volume and the Bh name="sbnd" />B bond angle are reduced. All samples present a single magnetic transition from ferromagnetic to paramagnetic phase, showing a decrease of the Curie temperature T c and the magnetization M when x increases (x ≤0.15). However, Cr doping makes the saturation magnetization at 5K to decrease, which indicates that the Cr3+ moments tend to be antiparallel to the Mn3+ moments at low temperature. The Cr-doped manganites exhibit a large variation in resistivity values. The increase of Cr doping (x ≤0.15) leads to an increase of the electrical resistivity. Below 10at.% of Cr3+, the electrical resistivity shows a metallic behavior, which is well fitted by the relation ρ = ρ 0 + ρ 2T2 + ρ 4.5T4.5, indicating the importance of the grain/domain boundary, the electron–electron scattering effects and, to a lesser extent, the electron–(magnon, phonon) scattering effects in the mechanism of conduction. On the other hand, the 15at.% of Cr3+ doping makes the material to exhibit a semiconductor behavior, for which the electronic transport can be explained by a variable range hopping (VRH) and small polaron hopping (SPH) models. Results are consistent with a reduction of the number of available hopping sites for the Mn e g (↑) electron due to the substitution of Mn3+ by Cr3+, which suppresses the double exchange (DE) interactions. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Alloys & Compounds is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jallcom.2012.04.026
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 8
        StartPage: 33
    Subjects:
      – SubjectFull: Magnetic properties of metals
        Type: general
      – SubjectFull: Transport theory
        Type: general
      – SubjectFull: Chromium compounds
        Type: general
      – SubjectFull: Perovskite
        Type: general
      – SubjectFull: X-ray spectroscopy
        Type: general
      – SubjectFull: Semiconductor doping
        Type: general
      – SubjectFull: Electric conductivity
        Type: general
    Titles:
      – TitleFull: Structural studies and magnetic and transport properties of Cr-substituted La0.67Ba0.33Mn1−x Cr x O 3 (0≤ x ≤0.15) perovskites
        Type: main
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            NameFull: Oumezzine, Marwène
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            NameFull: Peña, Octavio
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            NameFull: Kallel, Sami
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            NameFull: Guizouarn, Thierry
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            NameFull: Oumezzine, Mohamed
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            – D: 25
              M: 08
              Text: Aug2012
              Type: published
              Y: 2012
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              Value: 09258388
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              Value: 533
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            – TitleFull: Journal of Alloys & Compounds
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